How do you install python3.7 to ubuntu 20.04?

Solution 1:

For newer Python I prefer the deadsnake ppa. For installing it, try this:

sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.7

$ python3.7 -V
Python 3.7.7

Solution 2:

The Python 3.7 package from the official Ubuntu 19.10 repositories can be installed in Ubuntu 20.04 without adding any new repositories to your software sources by running the following commands:

sudo apt update  
wget -c http://mirrors.kernel.org/ubuntu/pool/main/libf/libffi/libffi6_3.2.1-9_amd64.deb http://security.ubuntu.com/ubuntu/pool/main/p/python3.7/libpython3.7-stdlib_3.7.5-2~19.10ubuntu1_amd64.deb http://security.ubuntu.com/ubuntu/pool/main/p/python3.7/libpython3.7-minimal_3.7.5-2~19.10ubuntu1_amd64.deb http://security.ubuntu.com/ubuntu/pool/main/p/python3.7/python3.7-minimal_3.7.5-2~19.10ubuntu1_amd64.deb http://security.ubuntu.com/ubuntu/pool/main/p/python3.7/python3.7_3.7.5-2~19.10ubuntu1_amd64.deb
sudo apt install ./libffi6_3.2.1-9_amd64.deb ./libpython3.7-minimal_3.7.5-2~19.10ubuntu1_amd64.deb ./libpython3.7-stdlib_3.7.5-2~19.10ubuntu1_amd64.deb ./python3.7-minimal_3.7.5-2~19.10ubuntu1_amd64.deb ./python3.7_3.7.5-2~19.10ubuntu1_amd64.deb

Add Python 3.7 to update-alternatives so that you can switch between Python 3.8 and Python 3.7 by running update-alternatives --config python3.

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7
update-alternatives --config python3